Dynamic mode decomposition of supersonic turbulent pipe flow with and without shock train

Low frequency dynamics of shock-turbulence interactions in constant area pipe flow with centre-line Mach number of 1.7 and friction Reynolds number of 245 is analysed using dynamic mode decomposition (DMD) of well-resolved large eddy simulation (LES) data. Two flow cases - one with a shock train and...

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Bibliographic Details
Published in:Journal of turbulence 2020-01, Vol.21 (1), p.1-16
Main Authors: Srinivasan, G., Mahapatra, Susila, Sinhamahapatra, Kalyan P., Ghosh, Somnath
Format: Article
Language:English
Subjects:
dynamic mode decomposition (DMD)
Turbulent pipe flows
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Summary:Low frequency dynamics of shock-turbulence interactions in constant area pipe flow with centre-line Mach number of 1.7 and friction Reynolds number of 245 is analysed using dynamic mode decomposition (DMD) of well-resolved large eddy simulation (LES) data. Two flow cases - one with a shock train and the other without shocks - are analysed. The dominant DMD modes show the near-wall sweep-ejection activity especially for the flow without shocks and also show the influence of the shocks on the near-wall organisation of the flow. The DMD modes also demonstrate a reasonable correlation between the near-wall coherent structures and the shock train for some of the modes.
ISSN:1468-5248
1468-5248
DOI:10.1080/14685248.2019.1710517